Sending two "load" requests to server makes it load twice

[ShuaiShao93]

Description
When I use two clients to send /v2/repository/models/MODEL/load requests to the same server at the same time, the model is loaded twice

Triton Information
What version of Triton are you using?
23.11

Are you using the Triton container or did you build it yourself?
Container nvcr.io/nvidia/tritonserver:23.11-py3

To Reproduce
Start a server in explicit mode, and load no model.

Open two terminals, run curl -X POST "http://localhost:8000/v2/repository/models/MODEL/load" -d "{}" at the same time. You can see logs like

 successfully loaded MODEL
loading: MODEL
successfully loaded MODEL
successfully unloaded MODEL

Expected behavior
The model should be only loaded once. And the log successfully unloaded MODEL should be before successfully loaded MODEL

[indrajit96]

Hi @ShuaiShao93 , thanks a lot for reaching out.
Can you provide with the following details

1. What type of model/backend?
2. Can you reproduce this behavior with other types of models/backends? Or is it specific to this one?
3. Not sure how are you getting the unloaded log? Are you making a unload request?

I am unable to reproduce this

When I try to load a model simultaneously it just gets loaded once.

[ShuaiShao93]

Hi @ShuaiShao93 , thanks a lot for reaching out. Can you provide with the following details

1. What type of model/backend?

Ensemble pipeline with Python & ONNX backends

2. Can you reproduce this behavior with other types of models/backends? Or is it specific to this one?

Sorry didn't get a chance to test more

3. Not sure how are you getting the unloaded log? Are you making a unload request?

No, I just made load requests simultaneously from two clients, and I saw the unloaded logs

I am unable to reproduce this

When I try to load a model simultaneously it just gets loaded once.